Wiktionary
unreadability
n. 1 The property of being impossible to read. 2 The property of being unfit for reading.
Usage examples of "unreadability".
Zared's face was unreadable, but StarDrifter thought he knew the man well enough to know that unreadability in itself did not bode ill for Drago.
Si Cwan’s face was an inscrutable mask that surpassed Spock’s for sheer unreadability, but if Shelby was going to guess at his mental state, it would be total chagrin.